Holley ProJection 4Di ?

[Robert Gallant]

> Lately Holley released a digital programmable TBI system ProJection 4Di,

> 1) Have anyone out there had any hand-on experience with this particular 
> system?
>    I am especially interested in views around tuneability and fuel economy.
>    Also information around which CPU they use are valuable.

I have one on my supercharged Rx7.  It is VERY tunable.  So much so, that I am 
looking to put the car on a dyno to tune it.  But my installation isn't typical.
Holley supplies some base maps for V8 cars.

> 2) Holley claims the system to be "Sequential", what does that mean for
>    a TBI system with only 4 injectors?

I'm using the 700 cfm throttlebody with four 65 lb/hr injectors.  There is one 
injector firing per ignition pulse.  So each injector fires every fourth 
ignition pulse.

I put some of the maps on my web page.  If anyone is interested Email back to me
and I'll give them the address.

Later

Rob
gallant at oasys.dt.navy.mil